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- W2066370025 abstract "High-resolution electrical resistance R and $dR/dT$ measurements have been done in the (giant magnetocaloric) orthorhombic ${mathrm{Gd}}_{5}({mathrm{Si}}_{0.1}{mathrm{Ge}}_{0.9}{)}_{4}$ compound to study their evolution through more than 50 thermal cycles between 300 K and 10 K. A detailed characterization of R and $dR/dT$ behavior was made near the first-order magnetostructural transition at ${T}_{S}ensuremath{sim}80mathrm{K}$ and the second-order magnetic transition at ${T}_{N}ensuremath{sim}128mathrm{K}.$ Important precursor effects of the magnetostructural transition exist for $0.85<~{T/T}_{S}<~1,$ causing an oscillatory regime in $dR/dT$ below ${T}_{S}.$ The resistance of a ${mathrm{Gd}}_{5}({mathrm{Si}}_{0.1}{mathrm{Ge}}_{0.9}{)}_{4}$ sample initially exhibits a sharp peak at ${T}_{S}$ followed by an abrupt decrease towards a minimum slightly above ${T}_{S},$ but after a certain number of thermal cycles, a new $R(T)$ regime sets in with no peak at ${T}_{S}.$ However, no significant changes occur in $R(T)$ near ${T}_{N}.$ Thermal hysteresis associated with the first-order transition at ${T}_{S}$ shows a slow decrease upon thermal cycling, approaching virtual extinction after $ensuremath{sim}50$ thermal cycles. The change of the residual resistance with the number of thermal cycles was also studied and similarly displayed a saturation regime. A simple phenomenological approach is adopted in relation with the $R(T)$ behavior in different thermal cycles, since a rigorous microscopic description is very problematic at the stage due to the complexity of the problems at hand." @default.
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- W2066370025 date "2003-04-11" @default.
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- W2066370025 title "Anomalous behavior of the electrical resistivity in the giant magnetocaloric compound<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>0.1</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:…" @default.
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- W2066370025 doi "https://doi.org/10.1103/physrevb.67.134416" @default.
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